chunking or splitting for non-html files

Hello: 

Sorry if this topic has already been discussed, but I did not come up with anything searching through the archives. 

Is there a style sheet which will allow one to split or chunk the XML into smaller XML files? 

Similar to the html/chunk style sheets but leaving the document in docbook xml. 

Specifically I am looking to break out a larger document into smaller XML docs at specific sections. 

Sort of modularize a book. Break out say every sect2 as its own self contained XML file. 

Or split each sect1 into a series of articles?

Is there a style sheet in the docbook distro that would do this?

Thanks,

Gregorio